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Abstract

We have experimentally and numerically investigated photo-induced voltage (PIV) effect across a Au film with a dielectric grating. We observed strongly enhanced voltage when surface plasmon polariton (SPP) is excited. It was found that electrons in the Au film are driven to the propagation direction of SPP. We have numerically shown that dissipative force called as scattering force well elucidates the experimental result for the first time. It is also clarified that this effect can be attributed to the momentum transfer from SPP to free carriers in the Au film. Thus the effect we observed can be called as surface plasmon drag effect in analogy with the photon drag effect.

(a): Distribution of magnetic field intensity at 885 nm. (b): Distribution of magnetic field intensity at 1046 nm. In both cases calculation was done at normal incidence. The white lines depict the shapes of the dielectric grating and the Au film.

(a): Distribution of x component of scattering force. (b): Distribution of x component of Poynting vector force.(c): Distribution of x component of force on polarization. Calculation was done at the wavelength 925 nm and the incident angle 6 °. The maximum absolute value of each force is also shown.

(a): Distribution of x component of scattering force. (b): Distribution of x component of Poynting vector force.(c): Distribution of x component of force on polarization. Calculation was done at the wavelength 802 nm and the incident angle 6 °. The maximum absolute value of each force is also shown.